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Abstract

Running requires rapid hip movements. Increasing running speeds place increased loads on hip flexor and extensor muscles (Schache et al., 2011). It is unclear whether Division III track and field athletes with self-reported hip tightness would present altered sagittal plane hip mechanics while running and functional limitations when performing the Functional Movement Screen (FMS) deep squat. Objective: To investigate the relationship between hip tightness, as measured by the Functional Movement Screen (FMS) deep squat (DS), and running mechanics, as measured by the peak flexion and extension angles in Division III Track & Field athletes. Methods: Ten subjects completed the FMS DS and were filmed from both sides while running on a treadmill at 3 different speeds. Reflective markers were placed on the greater trochanter and lateral epicondyle of the femur. Absolute peak flexion and extension angles were obtained using Dartfish software. Results: DS was not a significant predictor of running mechanics. There were moderate positive correlations between peak hip flexion angles and DS. DS scores of 1 were associated with increased hip flexion ROM and decreased extension, especially on the left side. Runners who reported hip tightness had higher average DS scores. Conclusion: Self- reported hip tightness group showed earlier toe-off and increased flexion ROM during swing phase. Differences between groups are greater in hip extension. Findings also suggest asymmetries in the non-affected side for the tightness group. Future studies could investigate these changes in running mechanics in different planes of motion and injury prevalence in runners with self-reported hip tightness.

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